CN111220424B - Tunnel Boring Machine (TBM) carrying type advanced geological prediction system and method based on tunnel face gas monitoring - Google Patents
Tunnel Boring Machine (TBM) carrying type advanced geological prediction system and method based on tunnel face gas monitoring Download PDFInfo
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Abstract
The invention discloses a TBM (tunnel boring machine) carrying type advanced geological prediction system and method based on tunnel face gas monitoring, wherein a first gas conveying pipeline comprises a plurality of branch pipelines, bearings and a main pipeline, the head ends of the branch pipelines are connected with a gas inlet device, and the branch pipelines are connected with the main pipeline through the bearings; a gas filtering membrane is arranged in each gas inlet device; the tail end of the main pipeline of the first gas conveying pipeline is connected with a gas inlet of a gas filtering device, a gas outlet of the gas filtering device is connected with the head end of the second gas conveying pipeline, a gas pump is mounted at the tail end of the second gas conveying pipeline and connected with a gas collecting box, the gas collecting box comprises a gas storage area and a wire area, and a gas measuring instrument is connected to the tail of the gas collecting box and used for detecting gas in the gas storage area; and gas conveying pipelines are connected to two sides of the gas storage area, and the tail end of the gas collecting pipeline is connected with a tail gas treatment device. The device can quickly and directly monitor the change condition of the gas content of the tunnel face.
Description
Technical Field
The invention relates to a TBM (tunnel boring machine) carrying type advanced geological prediction system and method based on tunnel face gas content monitoring.
Background
Rock fractures and there is significant relative sliding displacement of the rock masses along the sides of the fracture surface, known as faults. The two disks of the fault move relatively and are pressed mutually to break nearby rocks to form a breaking zone which is approximately parallel to the fault plane and is called a fault breaking zone, which is called a breaking zone for short. Faults and fault broken zones are typical unfavorable geology in the tunnel construction process, disasters such as blocking, water inrush and the like are easily encountered when the faults and the fault broken zones are constructed by adopting a TBM method, and therefore advanced geological forecast work needs to be carried out. However, the existing advanced prediction technology mainly uses geophysical prospecting, and the method has the defects that TBM is required to stop working during detection, workers enter a cutter head, rock on the face of the tunnel is unstable and easy to fall off, the workers are extremely easy to injure, the working progress is delayed, and the intelligence is insufficient. The existence and the abnormity of fault gas can provide a new tunnel advanced geological prediction method, and CO are displayed according to related data2、SO2、H2The gas may be abnormal at fault, which is the important part of earth degassing and the main channel for earth exhaust. When fracture occurs, CO2、SO2、H2When the gas diffuses along the fault, the gas content at the fault is increased, and the forecasting effect is achieved. However, the prior art has some defects, the tunnel face gas is collected, the TBM is also required to stop tunneling, and workers enter the cutterhead to take the tunnel face gas. Meanwhile, the gas collection by the above method has no continuity, and may be contaminated to cause a reduction in prediction accuracy. Based on the above problems, it is desirable to provide a TBM-mounted advanced geological prediction system and method based on tunnel face gas monitoring.
Disclosure of Invention
The invention provides a TBM carrying type advanced geological prediction system and method which are simple to operate and can complete tunnel face gas monitoring based on less labor force, so as to overcome the defects in the gas collection aspect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a device that is used for in the TBM tunnelling process, installs gas inlet to TBM blade disc department, through first gas transmission pipeline, makes gas get into the system, finally realizes advance geological prediction through face gas content change characteristic:
the device comprises a first gas conveying pipeline, a second gas conveying pipeline, a third gas conveying pipeline, a gas filtering device, a gas pump, a gas collecting box, a tail gas treatment device and a computer control system;
the first gas conveying pipeline comprises a plurality of branch pipelines, 1 bearing and 1 main pipeline, the head end of each branch pipeline is connected with one gas inlet device, the tail ends of the plurality of branch pipelines are gathered in the inner ring of the bearing, the outer ring of the bearing is connected with the head end of the main pipeline, and a gas filtering membrane is arranged in each gas inlet device; the tail end of the main pipeline of the first gas conveying pipeline is connected with a gas inlet of a gas filtering device, a gas outlet of the gas filtering device is connected with the head end of the second gas conveying pipeline, a gas pump is mounted at the tail end of the second gas conveying pipeline and connected with a gas collecting box through a third gas conveying pipeline, the gas collecting box comprises a gas storage area and a wire area, a gas measuring instrument is connected to the tail of the gas collecting box, and the gas measuring instrument is used for detecting gas in the gas storage area; and gas conveying pipelines are connected to two sides of the gas storage area, and the tail end of the gas collecting pipeline is connected with a tail gas treatment device. The computer control system comprises three systems which are respectively: the gas extraction measurement control system, the data curve drawing system and the signal identification system jointly act to complete the gas collection, curve drawing and image identification processes.
As a further technical scheme, the gas measuring instruments comprise a plurality of replaceable gas measuring instruments which are arranged in different small boxes, and probes of the gas measuring instruments extend to the gas storage area.
As a further technical scheme, the gas inlet device is made of hard rubber and is in a horn shape.
As a further technical scheme, first gas conveying pipeline include 8 spinal branch pipes, 1 bearing and 1 trunk line, 8 spinal branch pipes can be rotatory along with TBM, 8 spinal branch pipe tail ends with the bearing inner circle is connected, the bearing inner circle can be rotatory along with 8 spinal branch pipes and TBM, the trunk line head end is connected to the bearing outer lane, the bearing outer lane is not rotatory along with 8 spinal branch pipes and TBM.
As a further technical scheme, the gas filtering device is internally divided into 4 layers of filtering membranes, and the gaps are sequentially reduced.
As a further technical scheme, a small door is arranged on the gas filtering device and can be opened, so that the filtering membrane can be cleaned or replaced conveniently.
Further, the second gas conveying pipeline and the third gas conveying pipeline are the same, a cable and the gas conveying pipeline are arranged in the pipelines, the cable is used for controlling the start and the end of the gas pump by the computer control system, and the gas conveying pipeline conveys gas to the gas collecting box.
Furthermore, the inner part of the gas collecting box is divided into an upper layer and a lower layer, wherein the upper layer is used for storing gas, and the lower layer is a wire area for passing a cable; the upper layer of the gas storage part is provided with a gas monitor probe which is inserted into the gas collection box for measurement.
Further, the computer control system comprises three systems: the device comprises a gas extraction measurement control system, a data curve drawing system and a signal identification system. Gas extraction measurement system passes through the wire and is connected with air pump, gas detection appearance and tail gas processing apparatus, and control air pump switch controls gas detection appearance switch, controls tail gas processing apparatus, receives gas measurement appearance test data result, mainly is gas content, and the unit is: ng/g; the data curve drawing system is used for drawing a curve of gas content changing along with time (or pile number), before the system is used, a TBM initial pile number needs to be input, tunnel lithology is input, time can be automatically obtained through a computer, after the curve drawing is completed, the curve is displayed on a display screen of a computer control system, meanwhile, a curve graph is divided and stored according to a certain time period (or a certain distance), and the storage time period (distance) can be adjusted according to needs; the signal recognition system is used for storing the trained fault or fault fracture zone related data for automatic recognitionData including CO and CO2、SO2、H2Waiting gas in different lithologic district faults, broken zone and both sides country rock apart from fault, broken zone rock gas content, the unusual whole width of gas, the gas halo width etc. information such as different distances of gas, the unusual whole width of gas means along with time (or pile number) impels, and gas content appears and begins to increase the point to gas content reduces to increase the time (or the distance) that the gas content value that corresponds goes through is regarded as a gas unusual whole width, and the unit is: m, the gas halo width refers to the time period (or distance) from the gas content starting increasing point to the gas content starting decreasing point, which is regarded as a gas halo width and has the unit: m, the whole between the starting increasing point and the reducing point must be continuously increased, and the gas halo width is also regarded as the advanced geological forecast distance, namely the distance between the gas abnormal point and the fault, and the unit is: and m is selected. And (2) extracting information from a curve graph which is stored in the data curve drawing system according to a certain time period (or a certain distance) by adopting a convolutional neural network calculation method, wherein the curve graph comprises the information that the content of gas in rocks and the content of gas start to increase and the content of a reduction point, inputting the extracted information into a trained automatic identification system for comparative analysis, and finally outputting the content of gas possibly occurring in front of a gas sampling point, the width of gas halo, the content of gas at a predicted fault and the prediction accuracy, wherein if a plurality of high values continuously appear in the predicted gas content, the width corresponding to the high value is the fault distance of the fault or a fracture zone, and the width of the gas halo is the prediction distance.
In a second aspect, the invention further provides a method for monitoring the gas content of the tunnel face by using the device, which comprises the following steps:
1) in the TBM tunneling process and before gas collection is started, a gas extraction measurement control system of a computer control system controls a tail gas treatment device to correct an instrument so that the content of gas in a gas collection box is stable;
2) when gas starts to be collected, the gas extraction measurement control system of the computer control system is used for opening the gas pump to extract gas, so that the gas enters from the gas inlet of the gas inlet device; the gas enters a gas filtering device along a first gas conveying pipeline for further filtering, and the gas sequentially passes through a plurality of layers of filtering membranes and is continuously conveyed along the pipeline;
3) after the gas enters the gas collecting box, the gas detector measures the gas content and transmits the data to the computer control system through an interface at the lower part of the small box; the data curve drawing system of the computer control system stores the data, draws a curve of the gas content changing along with the time or the pile number, displays the curve on a display screen of the computer control system, and simultaneously cuts and stores the curve graph according to a certain time period or a certain distance, wherein the storage time period or the certain distance can be adjusted according to the requirement;
4) through a signal recognition system of a computer control system, a curve graph which is stored in the data curve drawing system according to a certain time period or a certain distance is drawn, the information of the content of gas in rock and the information of the gas content starting to increase and decrease points are extracted by adopting a convolution neural network calculation method, the extracted information is input into a trained automatic recognition system for comparison and analysis, and finally the gas content, the gas halo width and the prediction accuracy which possibly appear in front of a gas sampling point are output; if a plurality of high values continuously appear in the predicted gas content, the corresponding width of the high values is the fault distance of a fault or a broken zone, and the width of the gas halo is the forecast distance;
5) according to the test requirement, the gas is measured sequentially through 1-4 steps along with TBM tunneling. The purposes of monitoring the gas content change of the tunnel face and forecasting the advance geology are fulfilled.
The invention researches a device for monitoring the gas content of the tunnel face on the basis of not stopping the work of the TBM, provides a new prediction means for advanced geological prediction, further improves the prediction accuracy, realizes the purpose of testing the gas content of the tunnel face under the condition of normal work of the TBM and improves the work efficiency. Compared with the geophysical prospecting monitoring method adopted at the present stage, the method has the advantages that:
1) the method breaks through the traditional pattern that advance geological prediction is realized only by a geophysical prospecting method, adds a new advance prediction method and adds a new theoretical basis for the prediction result;
2) the method can complete the advance geological forecast of the tunnel under the condition that the TBM does not stop working, thereby greatly improving the construction efficiency of the TBM;
3) through this device, do not need the manual work to carry out gas collection, the gas sample who collects has the continuity, and sample pollution degree is low, guarantees when reaching accurate forecast that the sample staff is difficult for being injured.
Description of the drawings:
the accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a left side schematic view of the present invention;
FIG. 2 is an internal view of a gas filter according to the present invention;
FIG. 3 is a front view of the gas detection of the present invention;
FIG. 4 is a left side view of the gas sensor of the present invention
FIG. 5 is a schematic view of the gas inlet placement at the TBM cutter head
FIG. 6 is a partial view of a first gas delivery conduit;
fig. 7 is a diagram showing the overall effect of the TBM mounting of the present invention.
The distance or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration. 1. A gas inlet; 2. a first gas delivery duct (2 a-branch duct; 2 b-bearing; 2 c-main duct); 3. a gas filtering device; 4. a gas filtration device wicket; 5. a second gas delivery conduit; 6. an air pump; 7. a third gas delivery conduit; 8. a gas collection box; 9. a gas delivery conduit; 10. a capsule; 11. a wire insertion opening; 12. a tail gas treatment device; 13. a wire insertion opening; 14. a filtration membrane in the filter; 15. the gas detector is connected with the computer data transmission port; 16. a gas detector detection probe; 17. a gas detector; 18. a TBM tunneling head; 19. TBM tunneling head cutterhead; 20. the apparatus of the present invention; 21. TBM Master control Room.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background, there are problems associated with the current desire to advance geological prediction by collecting tunnel face gases. There is a need to develop a method for tracking the gas content change of the tunnel face at any time without influencing the tunneling of the TBM. Therefore, the invention designs the tunnel face gas monitoring device capable of being carried on the TBM, which can solve the problem of collecting and monitoring tunnel face gas at any time and realize advanced geological forecast.
As shown in fig. 1, the TBM-mounted advanced geological prediction system based on tunnel face gas monitoring according to the present embodiment includes a gas collection system, a gas detection system, and a computer control system (not shown), and is shown in fig. 7 in a specific mounting form.
The gas collecting system comprises a gas conveying pipeline 2, one end of the gas conveying pipeline 2 is used as a gas inlet 1, a primary filtering membrane is arranged at the gas inlet 1, the tail end of the gas conveying pipeline 2 is connected with an inlet of a gas filtering device 3, multiple layers of filtering membranes are arranged in the gas filtering device 3, and four layers of filtering membranes are arranged in the gas filtering device 3; and there is a little door outside the gaseous filter equipment 3, can open, it is convenient to clear up or change gaseous filtration membrane, gaseous conveying line 5 is connected to 3 exports of gaseous filter equipment, this gaseous conveying line 5 end connection air pump 6, air pump 6 power is big, can ensure that gaseous from gas inlet 1 admission gear, the beginning and the end of this air pump 6 bleed are all controlled by computer control system, the end connection pipe of air pump 6, there are air duct and wire in the pipe, the air duct is used for sending gas to the gas collection box 8 from the air pump in, the wire is used for computer control system control air pump switch, end connection gas collection box 8 at the pipe.
Further, as shown in fig. 5 and 6, the gas conveying pipeline 2 includes 8 branch pipelines 2a, 1 rotatable bearing 2b and 1 main pipeline 2c, the head ends of the 8 branch pipelines are respectively connected with 8 gas inlet devices, 8 gas inlets are directly mounted at the TBM cutter head, the tail ends of the 8 branch pipelines are gathered at the bearing inner ring, the bearing outer ring is connected with the head end of the main pipeline, and a gas filtering membrane is arranged in each gas inlet device. 8 spinal canal says can be rotatory along with TBM, 8 spinal canal say the tail end with the bearing inner circle is connected, the bearing inner circle can be rotatory along with 8 spinal canal says and TBM, the trunk line head end is connected to the bearing outer lane, the bearing outer lane is not rotatory along with 8 spinal canal says and TBM.
Further, in the present embodiment, the gas collecting box 8 is a rectangular structure as a whole, and is divided into an upper layer and a lower layer, the upper layer is used for storing gas, and the lower layer is used for a conducting wire to pass through; or the lower layer is used for storing gas, and the upper layer is used for leading through, and is arranged according to the actual situation.
As shown in fig. 3 and 4, the gas detection system includes a gas detector 17, the gas detector 17 is disposed in a small box 10 at the tail end of the gas collection box 8, there are 4 small boxes, a gas detector 17 is disposed in each small box 10, and each gas detector can be taken out from the small box to replace other gas measurement instruments.
Of course, it is understood that the number of the small boxes is not limited to 4, and may be less than four or more than four, and the number is selected and set according to the actual situation. Meanwhile, the gas measuring instrument in this embodiment is an existing gas measuring instrument, and the structure thereof is not described herein.
The gas detector 17 probes the gas detector probe 16 into the gas collecting box 8 for gas monitoring through a small hole in the small box, and the lower part of the gas detector 17 transmits the tested data to the computer control system through a lead. The two sides of the gas collecting box are respectively connected with a gas conveying pipeline 9, the tail end of the gas conveying pipeline 9 is connected with a tail gas treatment device 12, and the computer control system corrects the gas detection device by controlling the tail gas treatment device.
The computer control system mainly comprises a computer, the computer is used for receiving, storing and processing the gas detection result, controlling the start and the end of the gas pump and correcting the gas content in the device; specifically, the computer control system comprises three systems which are respectively: the device comprises a gas extraction measurement control system, a data curve drawing system and a signal identification system. Gas extraction measurement system passes through the wire and is connected with air pump, gas detection appearance and tail gas processing apparatus, and control air pump switch controls gas detection appearance switch, controls tail gas processing apparatus, receives gas measurement appearance test data result, mainly is gas content, and the unit is: ng/g; the data curve drawing system is used for drawing a curve of gas content changing along with time (or pile number), before the system is used, a TBM initial pile number needs to be input, tunnel lithology is input, time can be automatically obtained through a computer, after the curve drawing is completed, the curve is displayed on a display screen of a computer control system, meanwhile, a curve graph is divided and stored according to a certain time period (or a certain distance), and the storage time period (distance) can be adjusted according to needs; the signal recognition system is used for storing the trained fault or fault fracture zone related data automatic recognition model, and the data comprises CO and CO2、SO2、H2Waiting gas in different lithologic district faults, broken zone and both sides country rock apart from fault, broken zone rock gas content, the unusual whole width of gas, the gas halo width etc. information such as different distances of gas, the unusual whole width of gas means along with time (or pile number) impels, and gas content appears and begins to increase the point to gas content reduces to increase the time (or the distance) that the gas content value that corresponds goes through is regarded as a gas unusual whole width, and the unit is: m, the gas halo width refers to the time period (or distance) from the point of the gas content starting to increase to the point of the gas content starting to decrease, and is regarded as a gas halo width in unitComprises the following steps: m, the whole between the starting increasing point and the reducing point must be continuously increased, and the gas halo width is also regarded as the advanced geological forecast distance, namely the distance between the gas abnormal point and the fault, and the unit is: and m is selected. And (2) extracting information from a curve graph which is stored in the data curve drawing system according to a certain time period (or a certain distance) by adopting a convolutional neural network calculation method, wherein the curve graph comprises the information that the content of gas in rocks and the content of gas start to increase and the content of a reduction point, inputting the extracted information into a trained automatic identification system for comparative analysis, and finally outputting the content of gas possibly occurring in front of a gas sampling point, the width of gas halo, the content of gas at a predicted fault and the prediction accuracy, wherein if a plurality of high values continuously appear in the predicted gas content, the width corresponding to the high value is the fault distance of the fault or a fracture zone, and the width of the gas halo is the prediction distance.
The trumpet-shaped gas inlet is made of hard rubber, a primary filtering membrane is arranged at the inlet of the trumpet-shaped gas inlet, and pores of the primary filtering membrane are not too small, so that more gas can enter the device as much as possible.
In this embodiment, as shown in fig. 2, in the gas filtering device, the 4 layers of filtering membranes are arranged, gaps between the filtering membranes are sequentially reduced according to the gas flow direction, so as to realize multi-stage filtering, and the gas filtering device is provided with a small door which can be opened, so as to facilitate cleaning or replacing the filtering membranes; but is not limited to the 4-layer filtration membrane described.
In this embodiment, the air pump is used to accelerate the air to enter the device, and the power of the air pump is high, so that enough air enters the device.
In this embodiment, the conduit includes an electrical cable for controlling the start and end of the gas pump by the computer control system and a gas delivery conduit for delivering gas to the gas collection box.
The embodiment also provides a TBM carrying type advanced geological prediction system based on tunnel face gas monitoring, which comprises the following steps:
1) after each system is installed, in the TBM tunneling process and before the TBM tunneling process starts to work, a tail gas treatment device is controlled by a gas extraction and measurement control system of a computer control system to correct the gas content in the device;
2) after the correction is finished, the tail gas treatment device is closed through the gas extraction measurement control system of the computer control system, and the gas pump is opened to start gas extraction, so that gas enters the system from the gas inlet; simultaneously, opening a gas detection device and starting to measure the gas in the gas detection box;
3) the gas detection device transmits the tested gas content data to the computer control system, and the data curve drawing system of the computer control system collects and stores the data and draws a gas content change curve along with time, and the gas content change curve along with the TBM tunneling pile number can also be set to be drawn. (both curves can be used if the TBM is tunneling faster, or the time curve can be drawn if the TBM is tunneling slower, as the case may be)
4) And finishing one-time data detection, storage and drawing to finish one-time data acquisition.
5) Drawing a curve of the gas content changing along with time (or pile number) drawn by the system according to a data curve of the computer control system, and meanwhile, segmenting and storing the curve graph according to a certain time period (or a certain distance), wherein the storage time period (distance) can be adjusted according to needs; and controlling a system signal identification system by a computer, drawing a curve chart which is stored in the system according to a certain time period (or a certain distance) in the data curve, extracting the information of the content of the gas in the rock, the gas content which starts to increase and the gas content which starts to decrease by adopting a convolution neural network calculation method, inputting the extracted information into a trained automatic identification system for comparison and analysis, and finally outputting the gas content which possibly appears in front of a gas sampling point, the gas halo width and the prediction accuracy. If a plurality of high values continuously appear in the predicted gas content, the corresponding width of the high values is the fault distance of a fault or a broken zone, and the width of the gas halo is the forecast distance.
6) And repeating the operation processes of 1-5 according to the installation requirement, so as to complete the tunnel face gas monitoring and realize the advanced geological forecast. (Note: the air pump and the exhaust gas treatment device cannot work at the same time)
The invention researches a tunnel face gas monitoring device, solves the problems of difficulty in manually collecting face gas, work progress delay and the like at present, improves the construction efficiency and reduces manual operation. The device of the invention has the following advantages:
1) the gas anomaly monitoring belongs to a survey means in the field of chemical exploration, the method breaks through the traditional pattern that advance geological forecast is realized only by a geophysical prospecting means, a chemical exploration advance forecasting method is added, and a new theoretical basis is added for forecasting results;
2) the method can complete the advance geological forecast of the tunnel under the condition that the TBM does not stop working, thereby greatly improving the construction efficiency of the TBM;
3) through this device, do not need the manual work to carry out gas collection, the gas sample who collects has the continuity, and sample pollution degree is low, guarantees when reaching accurate forecast that the sample staff is difficult for being injured.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A TBM carrying type advanced geological prediction system based on tunnel face gas monitoring is characterized by comprising a first gas conveying pipeline, a second gas conveying pipeline, a third gas conveying pipeline, a gas filtering device, a gas pump, a gas collecting box, a tail gas processing device and a computer control system;
the first gas conveying pipeline comprises a plurality of branch pipelines, 1 bearing and 1 main pipeline, the head end of each branch pipeline is connected with one gas inlet device, the tail ends of the plurality of branch pipelines are gathered in the inner ring of the bearing, the outer ring of the bearing is connected with the head end of the main pipeline, and a gas filtering membrane is arranged in each gas inlet device; the tail end of the main pipeline of the first gas conveying pipeline is connected with a gas inlet of a gas filtering device, a gas outlet of the gas filtering device is connected with the head end of the second gas conveying pipeline, a gas pump is mounted at the tail end of the second gas conveying pipeline and connected with a gas collecting box through a third gas conveying pipeline, the gas collecting box comprises a gas storage area and a wire area, a gas measuring instrument is connected to the tail of the gas collecting box, and the gas measuring instrument is used for detecting gas in the gas storage area; gas conveying pipelines are connected to two sides of the gas storage area, and a tail end of the gas collecting pipeline is connected with a tail gas treatment device;
the joint of the bearing and the branch pipeline can rotate along with the TBM, and the joint of the bearing and the main pipeline does not rotate along with the TBM;
the computer control system comprises three systems which are respectively: the system comprises a gas extraction measurement control system, a data curve drawing system and a signal identification system; the signal recognition system is used for storing a trained fault or fault fracture zone related data automatic recognition model, extracting information from a curve graph stored according to a certain time period or a certain distance in the data curve drawing system by adopting a convolutional neural network calculation method, inputting the extracted information into the trained automatic recognition system for comparative analysis, and finally outputting the gas content possibly occurring in front of a gas sampling point, the gas halo width, the gas content at the predicted fault and the prediction accuracy, wherein if the predicted gas content continuously has a plurality of high values, the width corresponding to the high value is the fault distance of the fault or fracture zone, and the gas halo width is the prediction distance.
2. The tunnel face gas monitoring-based TBM onboard advanced geological forecasting system as claimed in claim 1, wherein the gas inlet devices of the plurality of branch pipes are installed at the TBM cutterhead.
3. The tunnel face gas monitoring-based TBM onboard advanced geological forecasting system as claimed in claim 1, wherein the gas measuring instruments comprise a plurality of replaceable gas measuring instruments which are arranged in different small boxes, and the probes of the gas measuring instruments extend to the gas storage area.
4. The TBM onboard advanced geological forecast system based on tunnel face gas monitoring as claimed in claim 1, wherein said gas inlet means is made of hard rubber and is in the shape of a horn.
5. The TBM-mounted advanced geological forecasting system based on tunnel face gas monitoring as claimed in claim 1, wherein the inside of the gas filtering device is divided into multiple filtering membranes, and the gaps of the multiple filtering membranes are sequentially reduced along the flowing direction of the gas flow.
6. The TBM-based onboard advanced geological forecasting system based on tunnel face gas monitoring as claimed in claim 1, wherein the gas filtering device is provided with an openable door.
7. The TBM onboard advanced geological prediction system based on tunnel face gas monitoring as claimed in claim 1, wherein the inside of the gas collection box is divided into an upper layer and a lower layer, the upper layer is a gas storage area, and the lower layer is a wire area.
8. The TBM carrying type advanced geological forecasting system based on tunnel face gas monitoring as claimed in claim 1, wherein the computer control system is connected with the gas pump, the gas detector and the tail gas treatment device through wires, the switch of the gas pump is controlled through the wires, test data of the gas detector is collected through the wires, and the tail gas treatment device is controlled through the wires.
9. A method for monitoring the gas content of a tunnel face by using the TBM carrying type advanced geological forecasting system based on tunnel face gas monitoring as claimed in any one of claims 1 to 8, is characterized by comprising the following steps:
1) in the TBM tunneling process and before gas collection is started, a gas extraction measurement control system of a computer control system controls a tail gas treatment device to correct an instrument so that the content of gas in a gas collection box is stable;
2) when gas starts to be collected, the gas extraction measurement control system of the computer control system is used for opening the gas pump to extract gas, so that the gas enters from the gas inlet of the gas inlet device; the gas enters a gas filtering device along a first gas conveying pipeline for further filtering, and the gas sequentially passes through a plurality of layers of filtering membranes and is continuously conveyed along the pipeline;
3) after the gas enters the gas collecting box, the gas detector measures the gas content and transmits the data to the computer control system through an interface at the lower part of the small box; the data curve drawing system of the computer control system stores the data, draws a curve of the gas content changing along with the time or the pile number, displays the curve on a display screen of the computer control system, and simultaneously cuts and stores the curve graph according to a certain time period or a certain distance, wherein the storage time period or the certain distance can be adjusted according to the requirement;
4) through a signal recognition system of a computer control system, a curve graph which is stored in the data curve drawing system according to a certain time period or a certain distance is drawn, the information of the content of gas in rock and the information of the gas content starting to increase and decrease points are extracted by adopting a convolution neural network calculation method, the extracted information is input into a trained automatic recognition system for comparison and analysis, and finally the gas content, the gas halo width and the prediction accuracy which possibly appear in front of a gas sampling point are output; if a plurality of high values continuously appear in the predicted gas content, the corresponding width of the high values is the fault distance of a fault or a broken zone, and the width of the gas halo is the forecast distance;
5) according to the test requirement, the gas is measured sequentially through the steps 1-4 along with the tunneling of the TBM, and the purposes of monitoring the gas content change of the tunnel face and forecasting the advance geology are fulfilled.
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| CN202010065359.2A CN111220424B (en) | 2020-01-20 | 2020-01-20 | Tunnel Boring Machine (TBM) carrying type advanced geological prediction system and method based on tunnel face gas monitoring |
| AU2020425444A AU2020425444B2 (en) | 2020-01-20 | 2020-12-10 | Tbm-mounted advanced geological prediction system and method based on gas monitoring at tunnel face |
| PCT/CN2020/135312 WO2021147552A1 (en) | 2020-01-20 | 2020-12-10 | Tbm-mounted advanced geological forecasting system and method based on tunnel face gas monitoring |
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| AU2020425444A1 (en) | 2022-08-04 |
| WO2021147552A1 (en) | 2021-07-29 |
| CN111220424A (en) | 2020-06-02 |
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